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American Focus > Blog > Tech and Science > Gastric bypass surgery may cut the risk of bowel cancer
Tech and Science

Gastric bypass surgery may cut the risk of bowel cancer

Last updated: June 25, 2025 10:35 pm
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Gastric bypass surgery may cut the risk of bowel cancer
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Gastric Bypass Surgery May Reduce Risk of Colorectal Cancer

Gastric bypass surgery is generally used for weight loss, but it may have other benefits

Gastric bypass surgery is generally used for weight loss, but it may have other benefits

Portra/Getty Images

A recent study has revealed that gastric bypass surgery, a common weight-loss procedure, may have additional benefits beyond shedding pounds. Researchers have discovered that this surgical intervention could potentially lower the risk of colorectal cancer by altering the levels of bile acids in the blood and small intestine. These findings have sparked hope for the development of new treatments for bowel cancer.

Understanding Gastric Bypass Surgery

Gastric bypass surgery is a surgical procedure that involves partitioning the stomach into a smaller upper pouch and a larger lower pouch. The small intestine is then rerouted to the upper pouch, allowing food and digestive juices to bypass a significant portion of the stomach and the initial section of the small intestine. This alteration in the digestive system often results in individuals feeling full faster and consequently losing weight.

Research Study and Findings

Prior research had hinted at a potential link between gastric bypass surgery and a decreased risk of colorectal cancer, prompting scientists to delve deeper into the underlying mechanisms. In a study conducted by Rebecca Kesselring and her team at the University of Freiburg, mice were fed a high-fat diet until they gained approximately 50% of their initial body weight. Subsequently, a portion of the mice underwent gastric bypass surgery, while the rest underwent a sham surgery that did not involve any rearrangement of their digestive organs.

To isolate the impact of gastric bypass surgery from weight loss itself, the researchers subjected the gastric bypass group and half of the remaining mice to a weight-reducing diet over six weeks. Following this, colorectal cancer cells were implanted into the colons of the mice. After an additional six weeks, it was observed that the colon tumors in the gastric bypass group were significantly smaller compared to both the mice that continued to gain weight and those that lost weight through diet alone.

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Moreover, the researchers noted that tumors had metastasized to the liver in only one out of 20 mice in the gastric bypass group, whereas this phenomenon was more prevalent in the sham surgery groups. This disparity indicated that factors beyond weight loss were at play in reducing the risk of cancer post-surgery.

The Role of Bile Acids

Further investigation led the research team to explore the role of bile acids in this phenomenon. Bile acids, essential for fat digestion, are typically produced by the liver and travel through the gall bladder, stomach, and small intestine before returning to the liver through the bloodstream. With gastric bypass surgery, the introduction of bile acids into the small intestine occurs at a later stage, potentially exposing them to a different mix of gut bacteria that can chemically modify these molecules.

The mice that underwent gastric bypass surgery exhibited reduced levels of primary bile acids in their colons and blood in comparison to the mice in the sham surgery groups. To validate the impact of bile acid alterations on cancer risk, another group of mice underwent a procedure that redirected their bile acids to a later section of the small intestine without involving stomach modifications. Remarkably, this adjustment resulted in lowered levels of primary bile acids in the blood, as well as a reduction in the size and spread of colorectal tumors, akin to the effects observed post-gastric bypass surgery.

Potential Implications and Future Directions

The findings from this study suggest that targeting primary bile acids could hold promise for cancer treatment. By identifying oral medications that can reduce these bile acids, researchers envision replicating the beneficial effects of gastric bypass surgery in individuals with colorectal cancer. Vance Albaugh from Louisiana State University emphasizes the potential of such interventions in managing cancer effectively.

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TAGGED:bowelbypasscancercutGastricRisksurgery
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